adding Organization#submissions([query], callback) + tests
Merge tag 'v0.5.0' into dev

v0.5.0 release
 * Changing `User#favorite()` to use `PUT` instead of `POST`
 * Adds `Organization#participation()` (taken directly from `User`)
 * Changing `User#participation()` to have a 3rd param `key` (changes signature, not backwards compatible)
Merge branch 'feature/organization-submissions' into dev

Conflicts:
	lib/graph/Organization.js
	test/lib/graph/Organization.js
version bump + changelog update
removing debug usage from lib (never used it)
Merge branch 'release/0.5.1'